release mechanism : 63 phrases in 21 subjects |
Armored vehicles | 5 |
Astronautics | 2 |
Automated equipment | 4 |
Automobiles | 1 |
Cycling other than sport | 5 |
Drilling | 2 |
Electrical engineering | 1 |
General | 1 |
Geophysics | 1 |
Information technology | 1 |
Makarov | 1 |
Mathematics | 1 |
Military | 6 |
Nautical | 3 |
Oil and gas | 1 |
Switches | 9 |
Technology | 7 |
Telecommunications | 1 |
Torpedoes | 2 |
Transport | 5 |
Weapons and gunsmithing | 4 |